Statistical efficiencies of the designs.

InvC = inventory code; Var = Variable; Y = Year; n = number of plots; M = mean; Pc(%) = computed power for independent and dependent samples and for the hypothesized mean; Pset = set power; Required n at given power (Pset) and % of mean change = required sample size at 2%, 5%, 10%, 15% …change in mean; InvPair = inventory pair; 2M IDP = two mean test for independent samples; 2M DEP = two mean test for dependent samples; 1M = one mean test (of hypothesized mean);* = actual sample size successfully detects the differences in mean change. See also abbreviations in Table 1.